import time
incomplete_sign = 50
print('='*23+'开始下载'+'='*25)
for i in range(incomplete_sign+1):
    completed = '*' * i
    incomplete = '.'*(incomplete_sign - i)
    percentage = round((i/incomplete_sign) * 100,2)
    print(f'{percentage}%[{completed}{incomplete}]')
    time.sleep(0.01)
print('='*23+'下载完成'+'='*28)
